Reply to Traktor License Key

I've got an S4, bought it used and the guy I bought it from won't reply to my emails to release the license key to my name. (That or he has been locked out of the email address he gave me.. I'd prefer to believe this)

I'm looking to sell it now to a local guy but he needs the license key to get it going

Since you get a license key with all of the Traktor gear now I figured someone's got a few spares they'd be willing to let go for cheap Please PM me if you've got one and your price.

Thanks,
Devon